\begin{table}[tbhp] \centering {\begin{tabular}{l*{5}{c}}
\hline
                    &\multicolumn{1}{c}{2002}&\multicolumn{1}{c}{2003}&\multicolumn{1}{c}{2004}&\multicolumn{1}{c}{2005}&\multicolumn{1}{c}{2006}\\
\hline
a11 last month hours worked&       162.1&       160.7&       160.0&       163.8&       164.1\\
                    &     (63.11)&     (68.41)&     (66.04)&     (65.41)&     (64.94)\\
 \hline
\hline
\end{tabular} } \end{table} 
